(19)

(11)

EP 2 715 470 A2

(12)

(88) Date of publication A3: 10.05.2013 (43) Date of publication: 09.04.2014 Bulletin 2014/15 (21) Application number: 12724700.5 (22) Date of filing: 22.05.2012

(51) International Patent Classification (IPC):  G05D 1/02(2006.01) (86) International application number: PCT/GB2012/051156 (87) International publication number: WO 2012/160373 (29.11.2012 Gazette 2012/48)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 24.05.2011 GB 201108965 24.05.2011 EP 11250557 (71) Applicant: BAE Systems Plc. London SW1Y 5AD (GB)	(72) Inventors: SMITH, Christopher, Andrew Bristol , South Gloucestershire BS34 7QW (GB) HESTER, Geoffrey James Bristol, South Gloucestershire BS34 7QW (GB) (74) Representative: BAE SYSTEMS plc Group IP Department  Farnborough Aerospace Centre Farnborough Hampshire GU14 6YU Farnborough Aerospace Centre Farnborough Hampshire GU14 6YU (GB)